Pocket, cycle, and other lamp



Jan. 29, 1929.

F. ECKHARDT ET AL POCKET, CYCLE, AND OTHER LAMP Filed April 14, 1927 2Sheets-Sheet INVGN Jan. 29, 1929. 1,700,673

F. ECKHARDT ET AL I POCKET, CYCLE, AND OTHER LAMP Filed April 14, 1927 2Sheets-Sheet 2 nvve NTog Patented is... 29,1929.

FRITZ EoKHAnnT AND MAX HOHNEKAMP, or EISENACH, GERMANY.

POCKET, CYCLE, AND OTHER LAMP.

Application filed Apri114, 1927, Serial No.'183,866, and in Germa ny-September is, 1926. i i

This invention relates to-pocket, cycle, policeman and other lamps, inwhich small incandescent lamps are employed and the object ofthe-invention is to provide an improvement with respect totheutilization of the dry battery for producing this value during a periodof about one third of the life of the battery and then gradually dropsto about 2.5 volts. The result thereof.

is that the small: incandescent lamp which is dimensioned for. thenormal voltage, works during'the largest portion of, its operation witha voltage which is too small, that is to I say, the light efficiency isrvery bad.

The invention consists in this that use is made in lamps of thecharacterabove referred to of a small incandescent lamp provided with two or moreincandescent filaments which are dimensioned tocorrespond to thedifferent voltages ofthe battery dur ing the life of the latter, incombination with a switching device which allows the insertion of one oftheincandescent filaments into the circuit of the battery, whichlattercircuit is closed and opened by the usual switch.

For a battery of the kind above referred.

to, use is. made, for instance, of asmall in-. candescent lamp with twofilaments, the one :of 3.5volts and the other at a voltage of 2.5 volts.Oneend of each ofthe two filaments is preferably. connected to the usualbottom contact of the lamp, whilst, the other end of one filament isconnected to the usual neck contact provided on the socket of the lampand the otherend of the second filament to an additionalcontact providedon the socket of the lamp and insulated from the usual neck contact- Atthe same timethe holder of the lamp is provided with an additionalcontact which is insulated from the usual;

screw'contact of the'holder and which, when the lamp is inserted inposition, makes contact with'the separate contact provided on of whichgivesthe best efiiciency at, a voltage lamp being inserted into" thecircuit unintentionally.

The selecting switch may be constructed in such a manner that it isoperated by the removal andreversal of the closing lid ofthe.

lamp casing carrying the incandescent lamp.

In the preferredform of constructionhow I i ever, the selecting switchconsists of aslid.-

ing contact provided'in the lid.

An indicating deviceis preferably used con unct1on with the selectingswitch for the purpose of indicating which one of the filaments isinsertedinto the circuit. o 'Two formsof constructlon for carryingtheinvention into effect as applied to a pocket 1 lamp are illustrated byway of examplein the accompanying drawings, in- ,which Figure 1 is asectional elevation ofa pocket I i lamp, in which one of thefilamentsisinsert-l.

ed into the circuit.

Figure Q is asimilar view showing the other filament inserted into thecircuit. I

Figure 2 illustrates an incandesc'entlamp 1 in cross section and on anenlarged scale.

Figures 3 and 4 are side views showing the indicating device of theselamps. 1 Figure 5 illustrates another form of pocket lamp also insectional elevation,

Figure 6shows th lid containmg the small incandescent lamp .asseen frombelow, and

Figure 7 shows'the headportion of theof normal construction having ashort vertical contact member 3 and along bent contact member 4. 5is theupper closinglid' also a made of'sheet metal and provided in its centrewitha reflector 6. 1'7 is-an insulating bar extending across the lid andprovidedunderneath its centre with a screw holder suitable to receiveasmallincandescent lamp.

The smalllamp 9 which is mounted in the holder 8. is constructed asfollows: The socket 10 is provided with the usual screw:

socket 1 1, the usualbottom contact 12 and in additionthereto with acontacting angularly shaped ring 13 which'is separated from the screwsocket 11 by means of an insulating ring 14. The lamp has two filaments115 and 16, one of which is dimensioned tor. a voltage of 3.5 volts andthe other one for azvoltage of 2.5 volts,the end of the first filamentbeing. connected to the socket 11, the one endiofthe second filament tothe ring 13, whilst the other ends of thetwo filaments are connected incommon to the bottom contact 12.

The lamp just referred to is screwed into the holder 8 so that thebottom contact 12 makes contact with the terminal contact 4 as usual.The holder 8 is connected to a contact strip 17 which is secured to thelower side of the insulating-bar 7, the said contact stripsaid contactstrip having an upwardly bent end which, when the lamp 9 isscrewed intothe socket, comes to lie resiliently against the lower surface of thering 18 and another downwardly bent end which passes through a hole 190provided in the insulating part 7 underneath the latter'and forms atongue 180 'which'li'es symmetrically with respect to the tongue'18.

By removingthe lid from the position shown in Figure 2 and'replacing itafter it has been displaced through an angle of 180,

. as shownjin'Figure 1, the contact180 comes to lie opposite theterminal contact 3 in the position formally occupied by the tongue 18.According to the position of the lid it is pos sible, by displacing theslider 19, to insert into the circuit,"either the filament'15 whichisdimensioned for 3.5 volts or the filament 16, which" is dimensionedfor=25 volts. In

orderto indicate the'proper position of the lid 5 in the two cases thelid is provided on one of its narrow sides with an inspection .opening20' andthecasing l is provided at the corresponding,positions, with twoindications 21 and 210 respectively,'which mayfor instance indicate thevoltages 2.5 and 3.5

respectively, the one orv the other of these two indications beingvisible through thehole 20,

as shown in Figures 3 aud t.

Referring to Figures 5'to 7, 22 is the sheet metal casing of thelamp,which" is provided with a lower closing lid 23through which the batterycan'be-inserted in with a contact slider 24 by means of which theterminal contactof'the battery canbe conductively connected with thecasing. The upperclosing lid125 whichis provided with a lens, may behinged at 26 so that it may be opened and allow the small lamp to beinserted. Theholder 27 intended toreceive the'small lamp 9 is secured tothe lower surface of an insulating bar 28in the the socket.

The holder is connected to a conducting strip 29 the end of which isbent'upwardly over the bar 28 so as to form a resilient tongue 30. Thereflector 31, which is provided on the upper side of the'b'ar 28, isconnected to another conducting strip 290 which runs proximity of theupper edge-of;

Y the bottom contact-and the neck contact realong the upper surface ofthe bar 28 and the end of which is bent upwardly in the form ofaresilient tongue 300, being constructed and arranged symmetrical ,withrespect to the tongue 80. The lower opening of the reflector isvdimensioned in such a manner that when the small lamp is screwed in, thering 13 makes contact-with'therefleetor 31. A frame-like slider 82 ofapproximately rec:

tangular shape is arranged in'the upperli'd '25, the said sliderconsisting in the form ofrow sides makes contact with the tongue 30 I orits other narrow side makes contact with the tongue 300 so that,accordingto the posi tion of the slider 32, either the filament 151 orthe filament 16 is connected with the terminal contact 3 over the casing22 by the op? eration of the slider-24;. The'position of the frame 32can be ascertained from the outside by the actual position oftheprojections 33 and 84:. In order that the position maybe more readilyascertained, indications may be made on the lid. By arranging the frame32in such a manner that it may beplaced, not 7 only on the two endpositions, but also in a middle position in which neither the tongue 30nor the tongue 300 makes contact-there with, we obtain a double safetyagainstthe' lamp being unintentionally inserted into the circuit.

A particular advantage of the'construction according to theinvention isthat it requires but very small alterations in the lampcas'ings and'thatin-spiteof these alterations the-casings can also be used for ordinarysmall in j candescent lamps, a furtheradvantage being socket above thesaid neck contact and of larger-diameter than'the latter, meansforinsulating the said ring-from the saidneck contact, an incandescentfilament inthe-small lamp, the ends of which are connected withspectively, and a second incandescent filament in the said smalllamp,the ends of which the said casing, a lower detachable 'lidon the areconnected to the bottom contact and the said casing to allow the drycell to be inserted therein, an insulating bar having on its lowersurface a holder for the reception of a miniature lamp and on its uppersurface a reflector near the upper edge of the casing, a miniature lampdetachably inserted in the said holder and having a socket carrying abottom contact, a neck contact and an additional contact ring secured tothe socket, and of greater diameter than the neck contact and touchingthe reflector and means for insulating the contact ring from the neckcontact, the said incandescent lamp having an incandescent filamentconnected at its ends With the bottom contact and the neck contactrespectively, and a second incandescent filament connected at its endsto the bottom contact and the additional contact ring, two up- Wardlydirected and resilient contact tongues on the said bar connected Withthe holder and the reflector respectively, a terminal contact on the drycellin resilient connection With the bottom contact, a second terminalcontact on the dry cell, means for efiecting a conductive connection ofthe second terminal contact With the casing, a removable uppervlid inconductive connection with the casing, a slider within the said lidcapable of reciprocating movement for the purpose of placing the one orthe other of the tWo tongues in conside.v a c In testimony whereof Wehave signed our names to this specification.

v FRITZ EGKHARDT. 7 MAX HOI-INEKAMP.

ductive connection with the lid and means, fordisplacing the said sliderfrom the out-

